Good color/sharp image, 70/30 min centering after that edges and corners. Back is not an issue unless they where previously glued down. Look for HOF cards with stats circled - they go for next to nothing because they dont grade high.
'72's a nice set, but the last two series are a bear - I stopped at about 85% - with most stars - couldent rationalize the price for hi series commons.
Good Luck